Summary:
The presence of this species in the Pacific Northwest requires confirmation. Features include a generally spathulate form, off-white to beige or warm brown color, very crowded gills, growth on hardwood logs, a white spore deposit, and small nearly round spores, (Thorn(2)). The description is derived from Thorn(2).
Hohenbuehelia angustata was reported from BC by Davidson (1930) and Lowe (1969) but status needs confirmation. Distribution is normally northeastern in North America, including MB, ON, QC, IA, KS, ME, MI, NY, NC, WV, (Thorn(2)). It is also reported (Laferriere(1)) from Mexico.
Cap:
2-5cm long and 1-4(5)cm broad, flabelliform to spathulate or dimidiate [fan-shaped to spatula-shaped or semicircular], margin incurved at first; ground color off-white near margin to buff or tan near base, becoming darker when old to beige and to warm brown at base; finely frosted near margin to downy-tomentose near base with patches becoming bald when old
Flesh:
cap 0.1-0.4cm thick
Gills:
decurrent but ending in a tomentose sterile area on pseudostem, narrow, close (6 per millimeter); white at first, through buffy to tan-colored when old or on drying; finely frosted under 10x power hand lens
Stem:
none, although cap tapers to base (pseudostem) that is 0.2-2cm at point of attachment "with thick white rhizomorphs running through substrate from base"
Microscopic spores:
spores (2.5)3.0-5.5 x (2.5)3.0-4.0 microns, ovate to nearly round or round, smooth, inamyloid; basidia 4-spored, 18-22 x 5.5-6.5 microns, clavate-cylindric, colorless; pleurocystidia as metuloids 45-75 x 10-16 microns, lanceolate, colorless, pale brick red in Melzer''s reagent, walls commonly 2.0 microns thick, up to 3.5 microns thick, becoming encrusted at tips, cheilocystidia numerous, 25-36 x 7-8 microns, fusoid to clavate or lageniform, colorless, thin-walled, occasionally with an apical hour-glass 5-7 x 2-3 microns, with or without a ball of mucus 4-7 microns in diameter; older specimens often develop vegetative hyphae between their gills, these with the large hour-glass secretory cells typical of its Nematoctonus state, 8-11 x 3-5 microns; cap cuticle a densely interwoven layer 8-15 microns thick of hyphae 1.5-5 microns wide, with clamp connections, with loose tufts of tomentum hyphae 50 microns or more tall, and scattered, prostrate metuloid pileocystidia 60-80 x 4-7.5 microns with colorless to brownish walls about 1.0 micron thick; gelatinous zone immediately below, 180-250 microns thick, of sparse, tangled hyphae 2-5 microns wide, with clamp connections
Spore deposit:
white
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